Clamping device



Nov. 6, 1951 J. H. ANDERSON 2,574,007

CLAMPING DEVICE Filed Aug. 1, 1946 E9 41 .JFZZ' :ZR 40 51 a5 55 44 5 4 a 52 45 4e, 20 41 um INVENTOR zfitme lfiqkdhnsbn/ HI 5 ATTORNEY.

Patented Nov. 6, 1 95l V CLAMPING'DEVICE' James :Andlerso n, Eastonpt l ag "assignor to 'Ingers'oll-Rand ;Gompany,'-New- York,

corporation of New Jersey N. Y., a

Application August 1, 1946', Serial no. 687,777

*This invention relates to -supporting devices,

and-more particularly to a clamping device for -scuring a rock drilling-mechanism to a supporting element, as for example a quarry- -ba'r or column arm. 1

One object of the invention is to enable a rock drilling mechanism to be conveniently and quickly attached to the supporting element and adjusted with respect to the working surface.'

A further object is to enable the rock drilling mechanism to be swiveled with respect tothe clamping device without disturbing the connection betweenthe' clampingdevice and itshs upport. j };Other objects will be in part bViOuSI and in ,partpointed out hereinafter. f @In the drawings accompanying this specification and in which similar reference numerals refer to similar parts,

Figure 1 is a side elevation-of a clamping deeviceconstructed in accordance-with theipractice of the invention and rock drilling mechanism and support means therefor to which the clamping device is applied,

Figure 2 is an elevation, partly in section, of the clamping device and a fragmentary portion of a rock drill shell,

Figure 3 is a transverse view taken through Figure 2 on the line 3-3,

Figure 4 is a view similar to Figure 2 showing a modified form of the invention, and

Figure 5 is a transverse view taken through Figure 4 on the line 55.

Referring to the drawings and at first more particularly to Figure 1, the clamping device designated in its entirety by is shown arranged on an arm 2| of an extensible drill column 22 for securing a rock drilling mechanism 23 thereto.

The rock drilling mechanism may be of a well known type consisting of a rock drill 24 for actuating a Working implement 25 and a shell 26 wherein the rock drill is arranged for slidable endwise movement and actuated thus by a feed screw 21. 4

The clamping device 2|], constructed in accordance with the practice of the invention, comprises a pair of plates 28 and 29 having in-their opposed surfaces partly circular recesses 30 to accommodate the arm 2|. On the outer surface of the plate 29 is a partly circular flange 3! the inner surface 32 of which is contoured to conform with a conical surface 33 of an extension 34 depending from the intermediate portion of solaiins. (on. 255141) theshelffli and seating at its free and upon a surface 35 on the plate 29.

assembled positions of the plates lie in overlapping irelation and "bear against each other. 'In

theiopposite ends of the plates is a bolt 48 the head of which rests upon the .outer surface of the 1plate 29 and anut'42 threaded onto the new acts against the outer surface of the plate 28 for clamping the plates to the arm 2|.

Owing to'this arrangement, the'flanges 38and 39 will prevent separation of the ends of the "plates adjacent thereto during the application of clamping pre'ssure tothe opposite ends of the plates andthe clamping devicemay be clamped securelyto-the -arm2l and held thus by a single men.

A bolt 43 is also arranged in the ends of the plates 28 and 29 adjacent the stepped portions 35 and 31 to bear with its head 4| against the outer surface of the plate 28, and said bolt is threaded into a clamp 44 having a beveled surface 45 to conform with and seat against the conical surface 33 for clamping the extension 34 against the surfaces 32 and 35. The clamp 44 is further provided with a tapered surface 46, located diametrically opposite the surface 45, for engagement with a correspondingly tapered surface 41 on the plate 29 to assure the correct position of the clamp 44 with respect to the conical surface 33 and also to urge the clamp 44 in the direction of the extension 34 during the application of clamping force to the bolt 43.

The holes 48 in the plates 28 and 29 through which the bolt 43 extends are of sufficiently larger diameter than the bolt to permit of such sidewise movement of the latter as may be required to assure full areas of engagement of the clamp with the conical surface '33 and the tapered surface 41.

In practice; whenever it is intended to assemble the clamping device upon the arm 2| the plates 28 and 29 are placed on opposite sides of the arm, at different points along its length, and are then moved toward each other to bring the flanges 38 and 39 into interlocking engagement with each other. The plates are then clamped to the arm 2| by means of the bolt 40 and the nut 42. Thereafter, the extension 34 of the shell is placed upon the clamping device and securely clamped against the seating surfaces 35 and 32 with the bolt 43 and the clamp 44.

Whenever it is intended to turn the drilling mechanism out of alignment with the hole being drilled, as when changing working implements or positioning the rock drill for the drilling of a new hole from the same setting, it is-merely necessary to manipulate the bolt 43 and this may be accomplished without altering the gripping force of the plates 28 and 29 on the arm 2|.

The modified form of the invention differs from that previously described mainly in that the ends of the plates 28 and 29 adjacent the stepped portions 36 and3'l are provided with slots 49 for the accommodation of a bolt 50 serving to clamp the shell 26 to the clamping device and the head of the bolt 50 has a bevinto the clamp and acting against one plate for clamping the conical extension against the seating surface and to assist in clamping the plates to a support, means in the opposed surfaces of the plates between the recesses and said bolt interlockingly engaged to hold one end of the plates together, and a bolt in the other end of the platesv for clampin'gsaid plates to a support member. I,

3. In a clamping device for rock drilling mechanism having a conical extension, a pair of plates having recesses in opposed surfaces thereof to receive a support member, a seating surface on one plate for the conical extension, a bolt in one end of the said plates having a beveled surclamping the conical extension against the seateled surface 52 for cooperation withthe conical surface 33. The head 5| also has a tapered surface 53 for engagement with similar surfaces 54 lying on opposite sides of the slot 49 in the plate 29.

I claim:

1. In a clamping device for rock drilling mechanism having a conical extension, a pair of plates having recesses in opposed surfaces thereof to receive a support member, a seating surface on one plate for the conical extension, means for clamping the conical extension to the seating surface, interlocking surfaces on opposed surfaces of the plates between the recesses and the said clamping means for holding the plates together on one side of the recesses, and means for applying pressure to the other ends of the plates for clamping said plates to a support.

2. In a clamping device, for rock drilling mechanism having a conical extension, a pair of plates having recesses in opposed surfaces thereof to receive a support member, a seating surface on one plate for the conical extension, a clamp seated in one plate to engage the conical extension, a bolt in one end of the plates threaded ing surface, and means in the opposed surfaces of the plates between the recesses and said bolt interlockingly engaged to hold one end of the plates together, and a bolt in the other end of the plates for clamping said plates to a support member.

, JAMES H. ANDERSON.

REFERENCES CITED The following references are of record in the file of this patent:

Great Britain Nov. 26, 1896 

